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| Study on the Corrosion Inhibition Behavior of B10 Copper Alloy by 8-hydroxyquinoline in Simulated Seawater Environment |
| Received:May 19, 2021 Revised:June 18, 2021 |
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| DOI：10.7643/issn.1672-9242.2021.10.012 |
| KeyWord:simulated seawater 8-hydroxyquinoline copper alloy corrosion inhibition behavior EIS |
| Author | Institution |
| ZHANG Xian-yong |
Weathering Test and Research Center of Science Technology and Industry for National Defense, Southwest Institute of Technology and Engineering, Chongqing , China |
| LU Zhong-hai |
College of Chemistry and Chemical Engineering, Yantai University, Yantai , China |
| LIU Jie |
College of Chemistry and Chemical Engineering, Yantai University, Yantai , China |
| LI Chuan-peng |
College of Chemistry and Chemical Engineering, Yantai University, Yantai , China |
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| Abstract: |
| This paper aims to study the corrosion inhibition behavior of 8-hydroxyquinoline (8-HQ) on B10 copper alloy in simulated seawater environment. The corrosion inhibition effect of different concentrations of 8-HQ in 1 mol/L NaCl solution on copper alloy was studied using potential polarization curve, electrochemical impedance spectroscopy (EIS) and weight loss experiments. The composition of the rust layer on the surface of the copper alloy was analyzed by the Fourier Transform Infrared spectrum analyzer (FT-IR). When copper alloy was immersed in NaCl solution with 8-HQ, its self-corrosion current density decreased and the impedance modulus value increased. With the increase of the concentration of 8-HQ, the corrosion inhibition efficiency of 8-HQ on copper alloy showed a stage characteristic of increasing first and then decreasing. When the copper alloy is immersed in 10 mg/L 8-HQ NaCl solution, the impedance modulus value and corrosion inhibition efficiency generally showed an increasing trend with the extension of the immersion time. Meanwhile, the presence of Cu(8-HQ)2 was further proved by the infrared spectrum analysis of the rust layer. The corrosion rate of copper alloy in NaCl solution was reduced due to the presence of 8-HQ, which was related to the formation of a protective film on the surface of copper alloy by 8-HQ to prevent the migration of oxygen from the solution to the cathode region. When the concentration of 8-HQ was 10 mg/L, it had the best corrosion inhibition effect on copper alloy. And the corrosion resistance of the copper alloy at this concentration continued to increase with the extension of the immersion time, which was mainly attributed to the fact that the [Cu(Ⅱ)HQ] chelate film formed by 8-HQ and Cu2+ and the increasing thickness of CuCl2 protective film produced a synergistic effect on the surface of the copper alloy, thereby inhibiting the corrosion reaction of the electrode. |
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